Adding Electric Dryer - Load Calculation Help!

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Cybatrex

Member
Location
Florida
I'm trying to understand load calculation and see if there is a faster way. If I am missing information to answer this question please let me know.

Scenario: You have 100A panel. You decide to go from gas range to electric range but you need an add a 220V 50Amp circuit to the breaker panel. Suppose there are 5 slots left for the sake of talking and plenty of room in the box. My understanding is the max of the 100A that's usable is 80% as a continuous load. Since some items are not continuous, how do we determine the max load here.

Questions:
a. How do I determine what amperage the house is currently using? I realize it may not use 80% but how do I figure this out?

b. What information do I need to determine whether or not I can add this breaker to the panel without going above 80%. Beyond turning the whole house on, what's the proper way to do this?
 
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Dennis Alwon

Moderator
Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
You can load the service up to 100% because a residential panel doesn't really have continuous loads. You cannot figure out the service load without having all the infomation about the equipment in the home.
 
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